Fluid-pressure brake.



w'.-v. TURNER.

FLUID PRESSURE BRAKE. APPLICATlON. FILED-FEB. I3. 1918.

1,297,518. PatentedMar. 18,1919.

INVENTOR Walter WDrneF WALTER V. TURNER, 0F WILKINSBURG, PENNSYLVANIA, ASSIGNOR TO THE WESTING- HOUSE AIR BRAKE COMPANY, OF WILMERDING, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

FLUID-PRESSURE BRAKE.

To all whom it may concern:

Be it known that I, WALTER V. TURNER, a citizen of the United States, residing at lVilkinsburg, in the county of Allegheny and State of Pennsylvania, have invented new and useful Improvements in Fluid- Pressure Brakes, of which the following is a specification.

This invention relates to fluid pressure brakes, and more particularly to a triple valve device.

When a very light reduction in brake pipe pressure is made to effect an application of the brakes, it sometimes happens that piston ring leakage from the auxiliary reservoir to the brake pipe side of the triple valve piston, especially if there is considerable piston friction, and th increase in auxiliary reservoir volume due to the displacement of the triple valve piston, is suflicient to prevent the creation of the difierential pressure necessary to effect the movement of the piston to application position.

The principal object of my invention is to overcome the above difficulty by maintainin the auxiliary reservoir pressure from an ad llitional source of fluid pressure, such as the supplemental reservoir, until the move ment of the triple valve parts to application position is assured. 1

In the accompanying drawing, the single figure is a diagrammatic view, partly in section, of a car brake equipment embodying my invention.

According to the drawing, my invention is shown as applied in connection with a triple valve device of the graduated release type comprising a casing 1 having a piston chamber 2 connected by passage 3 to the brake pipe 4, and containing triple valve piston 5, and having a valve chamber 6, connected by pipe 7 to an auxiliary reservoir 8 and containing a main slide valve 9 and a graduating slide valve 10, mounted on the main valve 9 and having a movement relative thereto, the valves 9 and 10 being adapted to be operated by piston 5.

A supplemental reservoir 11 is connected by pipe 12 to a passage 13 leading to the seat of slide valve 9, for effecting the graduated release of the brakes and, according to my invention, an additional passage 14,1eading to the seat of the main slide valve, is

Specification of Letters Patent.

Patented Mar. 18, 1919.

Serial No. 216,957.

connected through pipe 15 and a cut-out valve device 16 to the supplemental reservoir ll.v

The cut-out valve device 16 may comprise a casing containing a valve piston 17 constantly subject on one side to pressure in the supplemental reservoir 11 and sub'ect on the opposite side to the pressure or a coiled spring 18 and the pressure in pipe 15 which is supplied thereto through passage 19. A passage 20 connects the opposite sides of the valve piston 17 p I In operation, upon charging the brake pipe 41 with fluid under pressure, fluid flows through passage 3 to triple valve piston chamber 2 and thence through the usual feed groove21 around piston 5 to valve chamber 6, charging the auxiliary reservoir 8 in the usual manner.

Fluid also flows from valvechamber 6, through port 22 in main slide valve 9 to passage 13, the tripple valve parts being in release position, and thence through pipe 12 to charge the supplemental reservoir 11. In release position, a port 23 in the slide valve 9 registers with passage 14, so that fluid is also supplied to the supplemental reservoir by way of passages 19 and 20, and since the opposing fluid pressures on valve piston 17 are now substantially balanced, the spring 18 maintains the valve piston 17 in release position, as shown in the drawing.

In release position, as usual, the brake.

cylinder 24 is connected through pipe 25, passage 26, port 27 in slide Valve 9, cavity 28 in the auxiliary valve 10, and port 29, with exhaust port 30.

WVhen the brake pipe pressure is reduced to effect an application of the brakes, should the reduction be light, a suificient difl'erential pressure between the auxiliary reservoir and the brake pipe will still be obtained to e flect the movement of the triple valve ports to application position, in spite of possible excessive piston ring leakage and piston displacement, since the additional flow of fluid from the supplemental reservoir, through pipe 15, passage 14, and port 23, to the valve chamber 6 will operate to maintain the auxiliary reservoir pressure substantially constant. I

Upon movement of the triple valve ports to application position, the passage 14: will i have been applied, fluid is vented from the spring side of the valve piston 17 tovalv'e chamber 6,-fa-ster than itcan be supplied through therestricted passage, 20, so that the higher pressureon the opposite side of the valve piston Will operate same to cutofl Connection through passage 20 from thesupplemental reservoir 11 to the pipe .15, thus limiting the flow of fluid to valve chamber 6qto that' which is admitted through the I usual graduated release passage :13 and port 22. V s

' .xU'pon effecting a full release of the'brakes, When the auxiliary reservoir pressure"has been increased so as to'nearly' equal 'the'p'ressure in the supplemental reservoir, the

spring 18- Willshift the valve piston 17 to its normal release position.

Having now described my invention', -What I clainrasnew and'desire to secure by==Letters'latent, is 2- l. In a fluid pressure brake, the 'con'ibination with an auxiliary"reservoir and ampplem'en'talreservoir, of a" triple valve device havlng a port for connecting the' supple 1 mental reservoir" with the auxiliary reservoir and an additional port through which fluid is supplied from the supplemental reservoir to the'auxiliary"reservoir. 7 I

- 2.'-In a fluid pressurebrake, the combination with an auxilia'ryre'servoir' and asap-- plemental reservoir,- 1 of a triple v alve device having a mam valve and an 'auxllflary valve for controllin the supply f q fronfihe supplemental reservoir to the auxiliary reservoir for. efl'ecting afgraduated' releaseof the brakes; the main valve being adapted to 7 control an additional port for supplying plementalreservoir, of a triple valve device comprising a main valve, an auxiliary valve having a movementrelative tothemain' valve, and a piston for operating the auxiliary valve to close a port through which fluid is supplied from the supplemental reservoir to the auxiliary reservoir and for operating the main valve to close an additional port through which fluid is supplied from the" supplemental reservoir" to" the auxiliary reservoir. 1

4. In a fluid pressure -brake, the'combinationwith an auxiliaryreservoir'and a supplemental reservoir, of a triple valve de vice having' mea'ns forbontrolling the sup ply of fluid from the supplemental reservoir to the auxiliary reservoir and acut out valve device operated 'by reduced auxiliary reservoir pressure for cutting oli' the supply of fluid from tl16'sflpplemental lQSGFVOlT' to the auxiliar "reservoir.

*5; "In a fluid pressure brake, the combination with an auxrliaryreservoir anda sup plemeiital reservoir, "of a triple valve device havinga "communication adapted 'to be opened in the releasep'os'itio-n of the triple valve parts/for supplying" fluid from the supplemental reservoir to the auxiliary reservoir and a' but; out valve device op erating upon movement of the triple valvedevi'ce to release position for -ci'i ttingoff said 'connnunication. v

' 6; in'a'fluidfpressure brake, the combination With an' auxiliary 're seryoir and a supplementalreservoir; of a triple valve device having a main v'alve 'providedwith a ort for -e'stablishing'connection in' re'lease position fromthe supplementalreservoirto the auxiliary reservoir and a cutbut valve de-:

vice operated upon moveinent of the triple valve device from application to release "positron for cutting off the supply-of fluid from the 'sup plemental"reservoir 5 to the auxiliary reservoir, J p 7 In*test1mony"w-11ereo have hereunto set Gopiesof'this'pateilfmay'be"obtahred for 'fi'vei cents eaehjbyaiIdress'ing the commissioner of Patents, washingtownc. I 

